thermoplastic
ther-mo-plas-tic
adjective
Describing a plastic material that softens with heat and hardens upon cooling.
"Polyethylene is a thermoplastic polymer."
noun
A plastic material that softens when heated and hardens when cooled.
"Many common plastics are thermoplastics."
Thesaurus
Synonyms: thermoplastic resin
Antonyms: thermoset, thermosetting